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New technique of no pollution discharge for treating black liquor from papermaking

A paper-making black liquor and non-polluting technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. pollution and other issues

Inactive Publication Date: 2005-01-12
黄德丰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] There are two major deficiencies in the above-mentioned prior art. One is that the complete set of technological processes still produces more or less light or heavy pollution to the environment, including the discharge of waste residue and / or waste liquid and / or waste gas. In the treatment of liquid pollution, the technological process is not perfect; the second is that in the comprehensive utilization of black liquor, the heat energy of organic matter combustion in black liquor or the NaOH in lignin and inorganic substances have low added value, which is very important for black liquor treatment. The economic benefit contribution is not very significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The papermaking black liquor that the present invention adopts is straw alkali pulping black liquor, long-term puts without deposit and produces, and specific gravity is 1.1667, and solid content 9.12% (weight), carries out seven-step treatment to this black liquor below.

[0068] The first step collects the precipitate containing cellulose and hemicellulose: put a certain weight of black liquor into the alkali-resistant pool (1), add 99.7% ethanol at room temperature under stirring, so that the ethanol concentration in the solution reaches 25%, and fully stir Evenly, let stand for 8min until the sedimentation and stratification, the solution is pumped into the precision filter with washing function together with the precipitation, continuous filtration, the filtrate is sent in the alkali-resistant pool (2), and the filter residue is washed with 99.7% ethanol of equal weight Rinse three times at normal temperature, the washing solution is sent to the alkali-resistant poo...

Embodiment 2

[0085] The first step collects the precipitate containing cellulose and hemicellulose: put a certain weight of black liquor into the alkali-resistant pool (1), add 95% ethanol at room temperature under stirring, so that the ethanol concentration in the solution reaches 38%, and fully stir Evenly, let it stand for 10 minutes until the precipitation is separated, pump the solution together with the precipitation into a precision filter with washing function, and filter continuously. Rinse three times with ethanol at room temperature. All the other are with the first step process in embodiment 1.

[0086] The second step collects the precipitate that contains sugar: the filtrate and washing liquid in the alkali-resistant pool (two) of the previous step are added 95% ethanol to make the ethanol concentration in the solution reach 45%, and all the other are with the second step process in the embodiment 1.

[0087] The third step is to collect the sediment containing silica gel: s...

Embodiment 3

[0093] The first step collects the precipitate containing cellulose and hemicellulose: put a certain weight of black liquor into the alkali-resistant pool (1), add 96% ethanol at normal temperature under stirring, so that the ethanol concentration in the solution reaches 28%, and fully stir Evenly, when standing for 5min until the precipitation layered, the solution is pumped into the precision filter with washing function together with the precipitation, continuously filtered, the filtrate is sent into the alkali-resistant pool (2), and the filter residue is washed with 96% ethanol of equal weight. Rinse three times at room temperature. All the other are with the first step process in embodiment 1.

[0094] The second step collects the precipitate that contains sugar: the filtrate and the washing liquid in the alkali-resistant pool (two) of the previous step are added with 96% ethanol to make the ethanol concentration in the solution reach 60%, and all the other are with the ...

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Abstract

The invention relates to a method for processing pollution of black liquor created by papermaking, particularly a new technology without pollution discharging for the black liquor created by soda and sulfate pulp processing. Seven continuous processing steps are used to realize tractional centrifugal subsidence, main components in black liquor are separated out as form of precipitant step by step, remained neutral liquid is used to prepare hydrolyzate for extracting xylose. The main components of the precipitant being centrifugal subsided are: cellulose and half cellulose, saccharides, lignin, alkali fusion protein, silica gel, sodium sulfate and hydolyzate for extracting xylose.

Description

technical field [0001] The invention relates to the pollution control of papermaking black liquor, in particular to a new process for pollution-free discharge control of black liquor from alkali and kraft pulping. Background technique [0002] As we all know, the paper industry is a large water user and a major polluter of the earth's water environment. For example, in 1995, the wastewater discharge of papermaking enterprises at or above the county level in China was 2.4 billion tons, accounting for 10.8% of the total industrial wastewater discharge in the country, ranking first in the world. The third place, among which the chemical oxygen demand [CODcr, the same below] is 3.214 million tons, accounting for 41.8% of the national total, ranking first. If papermaking wastewater is not treated, it will flow into rivers, lakes, seas and some farmland at will, which will cause the loss of the function of the water body on the earth's surface, cause a large number of fish to die,...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F9/02
Inventor 黄德丰库爱莲
Owner 黄德丰
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